Would this be 2 heavy for gun sight installation or just what i need?

It might be to much for 271. It was designed for larger treads 3/8 + hold, and might make it impossible to remove at a latter time because of inability to apply enough heat and torque to remove from small treads like a scope mount. use Blue which is for small threads

Does this product require a primer? The fourth picture on Amazon suggests it does but the instructions do not mention a primer. Stainless + aluminum

I didn't need to. I used it on steel threads. Didn't even clean them. Applied this product and assembled. Hardened in minutes. I waiyed 24hrs before use just in case. Excellent product. I've used in the automobile repair industry for 30yrs.

Would this be appropriate for the locking nut on a sink faucet, that is always coming loose and making the faucet wobble?

Oh god no! This is for applications of extreme vibration and areas that's could be extremely dangerous if a bolt or nut came loose. All you should need for you faucet is the blue loctite. After using the red, you would need some serious heat and a breaker bar to free that nut if you needed to replace that faucet in the future.

if it is opened/used, how long will it stay fresh/usable?

Unopened/opened shelf life of Loctite 271 is two years from date of manufacture. Since exposure to oxygen is what keeps the liquid product stable, and it is packaged in a "breathable" plastic bottle, there is no change in shelf life once the product has been opened.

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271 Threadlocker for Automotive: High-Strength, High-Temp, Fluorescent, Anaerobic | Red, 6mL Tube (PN: 37421-487232)

Product ID: 254870418

Details

Brand
LOCTITE
Item form
Gel
Material
Metal
Special features
Strong
Specific uses for product
Automotive DIY

🔥Withstands -65°F to 360°F

🔴Fluorescent red for UV detection

⏱️10 min fixture time

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24815CFA

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Description

🔧 Lock it down, light it up, never let go!

RAPID SECURE CURE - Sets in just 10 minutes, fully cures in 24 hours—get back to work faster.
HEAT REMOVABLE DESIGN - Strong hold that’s removable with localized heat—perfect for maintenance without damage.
MILITARY GRADE STRENGTH - Tested to Mil-S-46163A for unbeatable reliability under shock and vibration.
FLUORESCENT UV DETECTION - Easily inspect application with UV light for quality assurance and peace of mind.
UNIVERSAL METAL COMPATIBILITY - Works flawlessly on all metals including stainless steel and aluminum, even with slight oil contamination.

LOCTITE 271 is a high-strength, red anaerobic threadlocker designed for heavy-duty automotive and industrial use. It cures rapidly, bonds all metal fasteners including passive substrates, and withstands extreme temperatures from -65°F to 360°F. Military-spec tested for shock and vibration resistance, it offers 3,000 PSI holding power and fluoresces under UV light for easy inspection. Ideal for securing bolts up to 1 inch (25 mm) with heat-removable convenience.

Specifications

ASIN	B0028OJAIY
Best Sellers Rank	#27,991 in Automotive ( See Top 100 in Automotive ) #108 in Automotive Fillers, Adhesives & Sealants
Brand Name	LOCTITE
Color	Red
Compatible Material	Metal
Container Type	Tube
Customer Reviews	4.7 4.7 out of 5 stars (631)
Full Cure Time	24 Hours
Global Trade Identification Number	00079340374218
Included Components	(1) 271 Red Heavy Duty Threadlocker, 6-milliliter Tube
Item Form	Gel
Item Package Quantity	1
Item Type Name	automotive-thread-lock-sealers
Item Weight	5 g
Manufacturer	Loctite
Material Type	Metal
Model	37421
Number of Pieces	1
Other Special Features of the Product	Strong
Part Number	37421
Specific Uses For Product	Automotive, Industrial, DIY, Furniture, Heavy-Duty
UPC	079340374218
Unit Count	1 Count
Viscosity Level	Low
Volume	6 Milliliters
Water Resistance Level	Water Repellent

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24815CFA

Duties & taxes included

In stock

Sold byAmazon SenegalDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to Senegal.

Secure transaction

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TrustScore 4.5 | 7,300+ reviews

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